<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <div id="app">
        <input type="button" value="添加数据" @click="add">
        <input type="button" value="移除数据" @click="remove">
    <ul>
        <li v-for="(it,index) in arr">
            {{index+1}}白马程序员校区:{{it}}
        </li>
    </ul>
    <h2 v-for="item in vegetables" v-bind:title="item.name">
        {{item.name}}
    </h2>
      </div>
      <script>
          var app = new Vue({
        el: '#app',
        data: {
                arr:["北京","成都","上海"],
                vegetables:[
                    {name:"西蓝花炒蛋"},
                    {name:"蛋炒西蓝花"}
                ]
  },
  methods:{
      add:function(){
          this.vegetables.push({name:"花菜炒蛋"})
      },
      remove:function(){
          this.vegetables.shift();
      }
  }
})
      </script>

</body>
</html>